Sounds to me like you probably got a hiatal hernia like many other people that don't even know it (stomach rides up and touches the heart wall..i think).
Stay off very hard foods for a while and eat less. Not knowing about my hernia, I had heart skips and all the other crazy symptoms for 5 months or so beacause of it. When my doc said I could have that, I started going on a soup diet last week and had no more problems since.
I still can't believe I suffered for months and prayed for a quick death coz of my stupid stomach.
Went to ER once and to the doc 7 times too...and found nothing!
Stay on a soup diet for a few days with no hard foods (maybe something softer). Also sleep on your side or back trying, with your head a bit elevated to make the stomach slide down..not towards our heart.
AAh! I'm late! gtg